Effect of the cryopreservation method used, the embryonic stage and the use of conjugated linoleic acid isomers on the cryotolerance of in vitro-produced bovine embryos / Efeito do método de criopreservação utilizado, estágio de desenvolvimento embrionário e uso de isômeros do ácido linoleico conjugado na criotolerância de embriões bovinos produzidos in vitro
Marinho, Luciana Simões Rafagnin; Ohlweiler, Lain Uriel; Barreta, Marcos Henrique; Gonçalves, Paulo Bayard Dias; Mezzalira, Joana Claudia; Mezzalira, Alceu.
Semina Ci. agr.
; 36(supl.2): 4297-4310, 2015. tab, graf
Artículo
en Inglés
| VETINDEX | ID: vti-29069
Conjugated linoleic acid (CLA) might be able to improve the cryotolerance of in vitro-produced (IVP) embryos. The effect of two CLA isomers on the cryotolerance of bovine IVP embryos, as well as that of the stage of embryonic development and the method used for cryopreservation was evaluated by three experiments. In Experiment 1, oocytes (n = 3,917) were fertilized in vitro and cultured with 0, 50, 100, or 200 μM trans-10, cis-12 (t10, c12 CLA). In Experiment 2, fertilized oocytes (n = 2,131) were cultured with 100 μM t10, c12 or cis-9, trans-11 (c9, t11 CLA), or a combination of both isomers. The embryos were vitrified at the blastocyst (BL) or the expanded blastocyst (EB) stage. In Experiment 3, oocytes (n = 1,720) were fertilized and cultured with or without 100 μM t10, c12 CLA, and the blastocysts were vitrified or frozen. Blastocyst development rate as well as the rates of re-expansion and hatching after thawing was recorded. Moreover, the mean cell number and mRNA expression of acetyl-CoA carboxylase (ACC1) and stearoyl-CoA desaturase (SCD1) as well as fatty acid synthase (FASN) multienzyme complex were determined. In Experiment 1, the highest concentration of t10, c12 CLA that did not reduce blastocyst development rate was 100 μM. In Experiment 2, the rates of re-expansion and hatching among the EBs obtained through IVP after supplementation with t10, c12 CLA (73.1% and 57.7%), with c9, t11 CLA (80.0% and 68.6%), with the combination (78.3% and 52.2%), and with the control group (85.4% and 58.3%) were similar. At the BL stage, the rates of re-expansion and hatching were lower than those at the EB stage, and CLA combination allowed a hatching rate (8.0%) lower than that observed in the control group (40.0%). In Experiment 3, the hatching rates for vitrified EBs (vitrified control; 67.4%) and vitrified CLA EBs (65.8%) were higher than those obtained for frozen EBs, exposed (13.3%) or not exposed (28.6%) to CLA.(AU)
Biblioteca responsable:
BR68.1
Ubicación: BR68.1
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